Libft

A custom C library created during the 42 curriculum.
It reimplements essential standard functions and provides useful tools for strings, memory, and linked lists.

Features

• Re-coded libc functions
• String and memory utilities
• Linked list helpers

Function List

Function	Description
ft_isalpha	Checks if a character is alphabetic
ft_isdigit	Checks if a character is a digit
ft_isalnum	Checks if a character is alphanumeric
ft_isascii	Checks if a character is a valid ASCII value
ft_isprint	Checks if a character is printable
ft_strlen	Returns the length of a string
ft_memset	Fills memory with a constant byte
ft_bzero	Sets a memory area to zero
ft_memcpy	Copies memory until a number of bytes
ft_memmove	Copies memory handling overlap safely
ft_strlcpy	Copies a string with size limit
ft_strlcat	Concatenates strings with size limit
ft_toupper	Converts a character to uppercase
ft_tolower	Converts a character to lowercase
ft_strchr	Finds first occurrence of a character in string
ft_strrchr	Finds last occurrence of a character in string
ft_strncmp	Compares two strings up to n characters
ft_memchr	Searches a byte in memory
ft_memcmp	Compares two memory regions
ft_strnstr	Locates a substring in a string
ft_atoi	Converts a string to an integer
ft_calloc	Allocates and zeroes memory
ft_strdup	Duplicates a string
ft_substr	Extracts a substring from a string
ft_strjoin	Concatenates two strings
ft_strtrim	Trims characters from beginning and end of string
ft_split	Splits string into array using delimiter
ft_itoa	Converts an integer to a string
ft_strmapi	Applies a function to each character and returns new string
ft_striteri	Applies a function to each character by reference
ft_putchar_fd	Writes a character to a file descriptor
ft_putstr_fd	Writes a string to a file descriptor
ft_putendl_fd	Writes a string with newline to a file descriptor
ft_putnbr_fd	Writes an integer to a file descriptor
ft_lstnew	Creates a new list node
ft_lstadd_front	Adds a node at the beginning of a list
ft_lstsize	Counts nodes in a list
ft_lstlast	Returns the last node of a list
ft_lstadd_back	Adds a node at the end of a list
ft_lstdelone	Deletes a node using a function to free its content
ft_lstclear	Deletes list and frees its nodes
ft_lstiter	Iterates on list and applies a function to each content
ft_lstmap	Maps a function to a list and creates a new list

Build

make

Usage

Include it in your project:

#include "libft.h"